Solid, stable diazonium compounds



i i' i j {TL-1"} We have f ound that solid,stable diazonium compounds are obtained byisolating in known rnanner gin a solid 2,914,521 SOLID, STABLEDIAZQNIUM COMPOUNDS Herbert Kracker and, Hans Albert, Offenbach (Main),

Germany, assignors to Farbwerke Hoechst Aktiengesellschaft vormals Meister Lucius & Briining, Frank-- J an: aim Main-, oermamaeei oianqn of Germany No Drawing. Application May 7, i957 A Serial No. 657,486

Claims priority, application Germany May 9, 1956 6 Claims. or. 260-141 The present invention relates to new solid, stable diazonium compounds corresponding to the renewing-general formula wherein X represents an alkyl or alkoxy group and N R represents a diaz'oniurir' chloride," 'tliazorr'ihr'ri 'sulfate, di-

azonium phosphate for diazonium chloi ide-zinc chloride form the' diazonium compound from an orthoamino-azo compound of the following general formula wherein X represents an alltyl or alkoxy group.

These hitherto unknown diazonium compounds are readily soluble in water and in many cases possess a very good stability. The new compounds can be isolated, for example, in the form of diazonium chlorides, diazonium sulfates, diazonium phosphates or diazonium chloridezinc chloride double salts. The technical value and the stability and good solubility of the compounds do not depend upon the method of isolation, but are determined by the special constitution of the diazo compounds themselves, and especially by the effect of the alkylsulfone group.

The new diazo-azo compounds can be mixed with the usual standardizing agents and worked up to stable dyeing salts which can be used for the production of valuable water-insoluble azo-dyestuffs on the fiber.

The ortho-amino-azo compounds used as starting material for the process of the present invention, which have not been described in literature, can be obtained by known methods, for example by coupling diazotized 1-amino-4- nitrobenzene-Z-alkylsulfones with l-amino-4-alkyl-3-alkoxybenzenes or 1-amino-3,4-dialkoxybenzenes or their derivatives capable of being coupled, for example the arylsulfonylamino compounds or N-sulfonic acids, and subsequently splitting oi? the arylsulfonic acid or the sulfonic acid group.

The following examples serve to illustrate the invention but they are not intended to limit it thereto, the parts being'by weight unless otherwise stated and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the liter.

p 2,914,521 Patented Nov...24, 1959 2 Example 1 by the addition ,of .320,parts of sodium sulfatef The crystalline'precipitate is suction-filteredpnd dried at moderate temperature. The product so obtained is a yellow crystalline powder which is readily soluble in water and exhibits a very good stability at" temperatures up to 40 C.

In the same manner the. following amino-azo compounds can be converted with agood yield into their diazonium sulfates, which likewise possess a good stability:

nitro-l,1'-azobenzene, 2-amino-4-me'thoxy 5 ethyl 2-methylsulfonyl-4-nitro- Example? 37.8 parts of 2-amino-4+methoxy-5-methyl-2-ethylsulfonyl-4'-nitro 1.,1'-azobenzene are dissolved at room temperature in 80.p arts by volume of phosphoric acid of strength and diazotized with 31.5 parts of nitrosylsulfuric acid of 41.9% strength. After dilution with 670 parts by volume of water and addition of 10 parts of kieselguhr, the solution is clarified by filtration. The diazonium phosphate of the amino-azo compound is separated from the filtrate by the addition of parts of mono-sodium phosphate. The crystalline precipitate is suction-filtered and dried at moderate temperature. The product so obtained is a yellow crystalline product which is readily soluble in water and exhibits a very good stability at temperatures up to 40 C.

Example 3 of 10 parts of sodium nitrite. After 2 hours the mixture is diluted with 1500 parts by volume of water and after the addition of 15 parts of kieselguhr the red-brown diazo-solution is clarified by filtration. From the solution so obtained the diazonium chloride-zinc chloride double salt of the amino-azo compound is separated by the addition of 7 parts of zinc chloride dissolved in a small amount of water, and the separation is completed by the addition of 300 parts of sodium chloride. The yellow-brown precipitate is suction-filtered and dried at moderate temperature. The product so obtained is a powder which is readily soluble in water and exhibits a good stability at temperatures up to 40 C.

In the same manner the following amino-azo compounds can be converted with a good yield into their diazonium chloride-zinc chloride double salts, which likewise possess a good stability:

2 amino 4,5-diethoxy-Z-methylsulfonyl-4'-nitro-l,1'-

azobenzene,

2 amino 4 methoxy-5-methyl-2'-n-propylsulfonyl-4- nitro-1,1'-azobenzene,

2 amino 4-methoxy-S-methyl-Z'-n-butylsulfonyl-4'- nitro-1 ,1-azobenzene.

3 We claim: L'The diazonium compounds corresponding to the following general formula I 0|.S I

wherein X represents a member selected from the group I consisting of methyl, ethyl, methoxy and ethox y, Y represents a member selected from the group consisting of methoxy and ethoXy, Z means a lower alkyl group containing from'l :54 carbon atoms and N R represents a radical selectedi'fr'omthe'group'consisting of diztzoniumchloride, dia zon iumsulfate, diazoniumphosphate and diazoniumchloride-zinc chloride. 7

2. The diazonium compound corresponding to the following formuln om N=N 00,11,

, S0,.CH; NEN

' I LZnCh tfollowing formula r l 3 "1,144,103" Kenn t s.

l tliezonium compound corresponding to the following formula I own, NEN

LZnCh 5. 'Iheoiazonium compound corresponding to the following formula I 6. The diazonlum' compound corresponding: to :the

OH; I MQMGOGH.

" 05.0mm) NEN LZnClr Refereneesfliteilinthe fileioffthislptef fi l :UNITED STATES PATENTS 2.469.682 Dickey May 1-0;1949 2,633,461 Seldenfaden'et al Mar. '31, 1953 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent Noo 2,914,521 November 24, 1959 Herbert Kracker 'et yalo It is herebja certified that error appears in the -printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 3, lines 5 to 8, inclusive, the left==hand portion of the formula should read as shown below instead of as in the patent:

SOMZ

L Signed and sealed this 24th day of May 1960.,

(SEAL) Attest:

KARL H AXLINE Attesting Officer ROBERT C. WATSON Commissioner of Patents 

1. THE DIAZONIUM COMPOUNDS CORRESPONDING TO THE FOLLOWING GENERAL FORMULA 